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tool for managing file archives of various types

atool is a script for managing file archives of various types (tar,
tar+gzip, zip etc). The main command is probably aunpack,
extracting files from an archive. It overcomes the dreaded "multiple
files in archive root" problem by first extracting to a unique
subdirectory, and then moving back the files if possible. aunpack
also prevents local files from being overwritten by mistake.